Hi my name isXXXXX am happy to try and help you. Hopefully together we can find a solution to your problem. I don't your abilities as far as trouble shooting the audio circuit in this unit but you can certainly replace the boards without too much effort. You can find these audio boards avialable at
Look at the very bottom you will see the Audio amp board. also there is the main board at 154.00 Not sure which one you would need unless you have some signal tracing equipment and knowledge on how to trouble shoot the audio circuit. I hope this helps.